使用图像列表设置表头图像.docxVIP

使用图像列表设置表头图像　 虽然我们可用直接指定位图设置表头图像，但我们也可以使用图像列表设置表头图像。步骤一：从CHeaderCtrl类导出CMyHeaderCtrl类。步骤二：添加变量protected: CImageList* m_pImageList; CMapm_mapImageIndex;步骤三：在构造函数中初始化变量m_pImageList=NULL;步骤四：加入下列函数 CImageList* CMyHeaderCtrl::SetImageList( CImageList* pImageList ){CImageList *pPrevList = m_pImageList;m_pImageList = pImageList;returnpPrevList;}intCMyHeaderCtrl::GetItemImage( intnItem ){intimageIndex;if(m_mapImageIndex.Lookup( nItem, imageIndex ) )returnimageIndex;return -1;}voidCMyHeaderCtrl::SetItemImage( intnItem, intnImage ){// Save the image indexm_mapImageIndex[nItem] = nImage;// Change the item to ownder drawnHD_ITEM hditem;hditem.mask = HDI_FORMAT;GetItem(nItem, hditem );hditem.fmt |= HDF_OWNERDRAW;SetItem(nItem, hditem );// Invalidate header control so that // it gets redrawnInvalidate();}步骤五：重载Drawitem()函数voidCMyHeaderCtrl::DrawItem( LPDRAWITEMSTRUCT lpDrawItemStruct ){CDC dc;dc.Attach(lpDrawItemStruct-hDC );// Get the column rectCRectrcLabel(lpDrawItemStruct-rcItem );// Save DCintnSavedDC = dc.SaveDC();// Set clipping region to limit drawing within columnCRgnrgn;rgn.CreateRectRgnIndirect( rcLabel );dc.SelectObject( rgn );rgn.DeleteObject();// Labels are offset by a certain amount // This offset is related to the width of // a space characterint offset = dc.GetTextExtent(_T( ), 1 ).cx*2;// Draw image from image listintimageIndex;if (m_pImageList m_mapImageIndex.Lookup(lpDrawItemStruct-itemID, imageIndex ) ){if(imageIndex != -1 ){m_pImageList-Draw(dc, imageIndex, CPoint(rcLabel.left + offset,offset/3 ),ILD_TRANSPARENT );// Now adjust the label rectangleIMAGEINFO imageinfo;if(m_pImageList-GetImageInfo( imageIndex, imageinfo ) ){rcLabel.left += offset/2 + imageinfo.rcImage.right - imageinfo.rcImage.left;}}}// Get the column text and formatTCHAR buf[256];HD_ITEM hditem;hditem.mask = HDI_TEXT | HDI_FORMAT;hditem.pszText = buf;hditem.cchTextMax = 255;GetItem(lpDrawItemStruct-itemID, hditem );// Determine format for drawing column labelUINT uFormat = DT_SIN